Add stress test to CI
Following four stress test scenarios are the most common scenarios we run during release testing.
Requires https://gitlab.isc.org/isc-projects/images/-/merge_requests/68 and https://gitlab.isc.org/isc-private/bind-qa/-/merge_requests/24 to be merged first.
Issues stress test stumbles upon: https://gitlab.isc.org/isc-projects/bind9/-/issues/1947, #1941 (closed), and #1942 (closed).
Pipelines: